US20030138169A1

US20030138169A1 - Angled sealing pattern for retort pouch to create cold corners

Info

Publication number: US20030138169A1
Application number: US10/054,066
Authority: US
Inventors: Alana Bell
Original assignee: Mars Inc
Current assignee: Mars Inc
Priority date: 2002-01-22
Filing date: 2002-01-22
Publication date: 2003-07-24
Also published as: WO2003062077A1

Abstract

The present invention is directed to an easy to handle retort bag. More particularly, the retort bag has a cold corner to provide a point of contact for the consumer, thus preventing scalding of the person handling the bag.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an easy to handle retort bag. More specifically, the retort bag has a cold corner to prevent scalding of the person handling the bag.

2. Related Art

Microwave packages for food products are well known and used in the food packaging art. The packages are generally formed from thermoplastic materials. Microwave packages, which use microwave energy to heat and cook food products, become extremely hot. Since the packaging is extremely hot, the consumer must result to an awkward manipulation of the hot package with consequent risk of spillage and/or scalding of the person manipulating the package.

Therefore, there is a need in the art for a microwave cooking package system which may be used to cook a fresh, frozen or refrigerated, cooked or uncooked food item in a microwave oven that is safe to be held by the consumer upon withdrawing the food item package from the microwave oven, does not bum the consumer, and is easy to open. Thus, the present invention allows for immediate handling of the package and eliminates the need for additional utensils to open the package.

BRIEF SUMMARY OF THE INVENTION

The present invention is directed to a retort bag having a top, a bottom and coplanar side edges. The top and bottom edges have transverse seals. In specific aspects, the top transverse seal is angled to provide a cold corner for handling the bag.

Another embodiment of the present invention is a method of sealing a retort bag having a cold corner by sealing a top portion of the retort bag in an angle to provide a cold corner for handling the bag.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention as set forth in the appended claims. The novel features which are believed to be characteristic of the invention, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention, reference is now made to the following descriptions taken in conjunction with the accompanying drawing, in which: [0009]
FIG. 1 illustrates a front view of the retort bag according to the present invention; [0010]
FIG. 2 illustrates a side view of a retort bag containing a cooked food item; [0011]
FIG. 3 shows a side view of a retort bag being handled by a cold corner; [0012]
FIG. 4 is a side view of a retort bag being opened; [0013]
FIG. 5 is a side view of an opened retort bag; [0014]
FIG. 6 shows the gussett bottom of a retort bag. [0015]

DETAILED DESCRIPTION OF THE INVENTION

It is readily apparent to one skilled in the art that various embodiments and modifications can be made to the invention disclosed in this Application without departing from the scope and spirit of the invention. [0016]
As used herein, the use of the word “a” or “an” when used in conjunction with the term “comprising” in the sentences and/or the specification can mean “one,” but it is also consistent with the meaning of “one or more,” “at least one,” and “one or more than one.”[0017]
Referring to FIG. 1, the retort bag ([0018] 10) is formed from a thermoplastic film, such as a polyethylene film. The bag contains a top (17), a bottom (18) and coplanar sides (19). The top (17) and bottom (18) sides have transverse seals. The bag (10) is sealed using standard techniques that are well known and used in the art of packaging.
The top transverse seal is angled to provide a corner ([0019] 11) for handling the bag (10). The corner is sealed with a thermal resistant film creating a cold corner. The cold corner (11) provides a point of handling for a consumer such that the consumer may use the cold corner (11) to open the bag without scalding of the fingers and/or hands. The angled seal that produces the cold corner (11) is typically wider than the side transverse seals, but generally not wider than one and half times the length of the cold corner (11). The length of the cold corner (11) will depend upon the size of the retort bag (10), however, it is contemplated that the cold corner (11) can generally be between 1½ to 2½ inches in length. Thus, the sealing pattern of the top transverse seal and the angled seal results in a corner that has dimensions that enable a consumer to handle the bag without scalding the person.
A horizontal heat seal ([0020] 13) extends along the top of the bag to complete the sealing of the bag. A nip (12) is provided at the top (17) of the bag (10). An additional smaller nip (14) may also be provided at the top (17) of the bag. The nips are V-shaped cut-outs extending horizontally from the top (17) of the bag (10). The nips are used to initiate tearing along a horizontal line of weakness (not shown).
Referring to FIGS. 1 and 2, the bottom transverse seal ([0021] 15) preferably extends in a curve downwardly and inwardly from at least one edge of the bag (10). The shape of the bottom transverse seal increases the ease of emptying the contents of the bag. Also, vents (16) may be included in the bottom transverse seal. It is well known to those skilled in the art that as the pressure inside a sealed bag (10) rises, the temperatures of vapors inside the sealed bag (10) also rises. To release pressure in the bag, a number of vents (16) typically are positioned in the bag to order to rupture and vent the bag during cooking.
FIG. 2 and FIG. 6 show the preferred embodiment of a bottom gusset ([0022] 20). Gussets are widely used in the packaging industry to provide flexible packaging. The bottom gusset (20) may comprise edge folds (18) and an inwardly directed center fold (21). Prior to cooking, the bag (10) is generally in a collapsed state, as shown in FIG. 1. Upon cooking, the bottom gusset (22) expands to increase the size of the bag (10) to contain the cooked food item, as shown in FIG. 2.
Referring to FIGS. 3, 4 and [0023] 5, after cooking the food item, the consumer can use the point of handling, the cold corner (11) to remove the bag (10) from the microwave. The cold corner (11) remains cool to the touch during the cooking process and, thus provides a point of handling without scalding the consumer. The nip (12, 14) is provided at the top of the bag (10) and is located within the cold corner (11). Thus, the consumer holds the bag at the cold corner and utilizes the nip to begin tearing or opening the bag. The nips (12,14) are V-shaped cut-outs extending horizontally from the top edge of the bag. The nips are used to initiate tearing along a horizontal line of weakness (not shown), which is below the horizontal seal (13) of the bag (11), resulting in easy opening of the bag (10). It is contemplated that other means for opening the bag may be used in the present invention, for example, but not limited to the use of a perforated edge. The top of the bag may contain a perforated line extending horizontally from the top edge of the bag below the horizontal seal. The perforated line may also include a tab, which extends outward from the bag or a nip.
Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps. [0024]

Claims

What is claimed is:

1. A retort bag comprising a top and bottom and coplanar side edges, the top and bottom having transverse seals, wherein the top transverse seal is angled to provide a cold corner for handling the bag.

2. The retort bag of claim 1, wherein the corner for handling is at least one and a half times as long as wide.

3. The retort bag of claim 1, wherein the bottom transverse seal extends in a curve downwardly and inwardly from at least one edge of the bag.

4. The retort bag of claim 1, wherein the corner comprises a nip for easy tearing of the bag.

5. The retort bag of claim 5, wherein the nip is a substantially V-shaped cut-out.

6. The retort bag of claim 1, wherein the corner is sealed with a thermal resistant film.

7. The retort bag of claim 6, wherein the corner is cool to touch after heating the bag.

8. The retort bag of claim 7, wherein the corner reduces scalding of a person handling the bag.

9. A method of sealing a retort bag having a cold corner comprising the step sealing a top portion of the retort bag in an angle to provide a cold corner for handling the bag.

10. The method of claim 8, wherein the cold corner is sealed with a thermal resistant film.

11. The method of claim 8, wherein the corner comprises a nip for easy tearing of the bag.

12. The method of claim 11, wherein the nip is a substantially V-shaped cut-out.